My vote is for the Velocity Aeroheat, I've recently built up a 32H 406mm rim with the SP hub and Conti's SportContact Reflex tyre. Got the rim from JensonUSA because the LBS couldn't find any (later heard that some popped up on special in AU that the LBS could order, not sure if any left but). Haven't tried the A23 but feel the Aeroheat is tougher.

When I was looking for rims a couple of months ago the Velocity website still listed the Aerohead rim as coming in 20" but I think that was a 451mm, not 406. So don't confuse Aeroheat and Aerohead. And if you look at Aeroheat on JensonUSA the option for the 406 in their scrolldown menu is 'Black BMX 20" x 1.5" 32H' so a little confusing too.

just4tehhalibut wrote:My vote is for the Velocity Aeroheat, I've recently built up a 32H 406mm rim with the SP hub and Conti's SportContact Reflex tyre. Got the rim from JensonUSA because the LBS couldn't find any (later heard that some popped up on special in AU that the LBS could order, not sure if any left but). Haven't tried the A23 but feel the Aeroheat is tougher.

When I was looking for rims a couple of months ago the Velocity website still listed the Aerohead rim as coming in 20" but I think that was a 451mm, not 406. So don't confuse Aeroheat and Aerohead. And if you look at Aeroheat on JensonUSA the option for the 406 in their scrolldown menu is 'Black BMX 20" x 1.5" 32H' so a little confusing too.

Thanks. Going by Velocity page here, there is only three options now in 20" - 406mm, the A23, the Aeroheat and the Cliff Hanger. I have a "LBS" in the family who can get the rims for me

Is being "tough" that critical up front? I was thinking A23 front and Aerohead rear. Thoughts? Which SP hub did you get?

Just to play devils advocate, Scorpion recently reported having a terrible run a while ago with Velocity aeroheat wheels (rim splits), although if I understood him correctly, he was running high volume tyres (Schwalbe Big Apples) at 50psi, which has been suggested to be max for high volume units.viewtopic.php?f=77&t=59339&hilit=dyad&start=125Having had a good run myself it wouldn't put me off, but I thought it worth mentioning for some perspective.

I'll be soon buying a rim for my planned xtra-wheel trailer purchase and I'll be buying yet another Velocity Dyad rim which is the 700c version of the Aeroheat.I plan to team it with a Son28 hub for potential auxiliary charging duties.I have the hub after an incorrectly delivered internet purchase.

I keep my oversized 2.35 tyres to 30psi to try to mitigate any problem or replicate Ricky's experience.On my 406 Aeroheats, I have no hesitation of running my 1.75 Marathons at approx 50psi and I've run Maxxis Grifters at 100 psi for a couple of months prior to going in the Marathon direction.

About equivalent to running your 25mm tyres at 180psi No wonder his rims cracked.

I'm not sure exactly what size rim/tyre width Ricky is/was running and caused his problems, but when I becameaware of it, I decided to run low pressures to attempt to ward off replication of his rim failure.

singlespeedscott wrote:Having had a number of velocity rims over the years I have decided that i prefer Mavic. Velocity rims are over hyped, easily dinged rubbish.

Its funny how one person can have absolutely no problems and love a particular brand of rim, whilst anotherobviously had the opposite experience and think said brand "rubbish".I heard people swear that Mavic were the spawn of the devil and "never again".I imagine its all in the luck of the draw.You just got to roll the dice and see where it leads

Schwable suggest a pressure range of 30-55 PSI for the Big Apple 2.35 according to the specifications on their German website ...

Funny also how here can be so many variations in tyre pressure recommendations. Frank Berto suggests a very different set of pressure ratings. A bit difficult to judge for larger sizes, but his graph suggests that about 45psi is best (for my weight) with 37mm tyres, and maybe 50psi when I have a fully-loaded bike. But my normal tyres are 47mm, and the Big Apples are nearly 60mm iirc. I'd expect that you'd need no more than 30psi to get a 15% tyre drop.

There's a new dynamo hub coming out in from SP Hubs, designed for the 15mm thru axle but with an adaptor if you want to use normal 9mm QR. The current series is 8 and this is designated as 8X, the X being 'extreme'. Slightly heavier than the PD-8 hub that I currently run but apparently more efficient. Better be as it's $70 more. Spotted on Ebay for pre-orders.The SP Hubs catalogue for 2014 on their main page has more blurb.

Cheers just4tehhalibut - been talked about for a while, nice to see it is almost here. "Adaptors for 135mm fat bikes are now available directly from an independent producer." That would be Kerry at k-lite

MichaelB wrote:Trying to source a PD-8 in 28 hole ( pref red to match rear hub) but can't seem to find one. Its so I can reuse my existing rim rather than buy another one which may be a bit hard to match.

MichaelB wrote:Thanks find bruce, but that $40 more than on ebay ??!!!

I'll keep looking, but may have to go with a black one ...

Yep, there is clearly some "marketing" going on when direct from the manufacturer costs more than re-sellers. I suspect marketing is also behind why red is available in the Exposure brand & really limited otherwise.

You need to find someone who wants an exposure light & is happy to swap hubs. Don't look at me though - $333 is out of my league.

MichaelB wrote:Thanks find bruce, but that $40 more than on ebay ??!!!

I'll keep looking, but may have to go with a black one ...

Yep, there is clearly some "marketing" going on when direct from the manufacturer costs more than re-sellers. I suspect marketing is also behind why red is available in the Exposure brand & really limited otherwise.

You need to find someone who wants an exposure light & is happy to swap hubs. Don't look at me though - $333 is out of my league.

Sorry for the very basic question...I'm very new to all this stuff, but getting VERY tired of all the batteries (combination of disposable and recharging) that I'm having to deal with on a regular basis as a 5am cyclist in Melbourne.

Do these hubs being discussed provide power when stationary (even for a little while) to power lights while stopped at traffic lights etc?

That is determined by the lights rather than the dynamo, but yes. Most high quality dynamo lights have a standlight (powered by a capacitor) that will power the light when stationary for about 5-6mins.

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